Screw driver



Feb. 24, 1942.

E. B. GREEN Y SCREW DRIVER Filed Dec. 10, 1940 (Ilillllll VM Il. l k I C INVENTOR y ggd/3.6116610 Patented Feb. 24, 11942 UNITED- vSTATES PATENT OFFICE f I Edgar B. Green, Washington, ILC.

Aplilkiltloll Delnbel' ,10, 194', Serial Ndilsssl 111mm..A

(Granted under the act of March 3,' 1883, as v amended April 30. 19287: 370 0. G. 757)' This invention relates to a screw driver, and has for an `object to provide an improved screw driver particularly adapted for inserting and re- A further object of this invention is to provide an improved screw driver having means for gripping and holding the screw, either for starting or removing the screw from holding position.

Still a further object of this invention is to provide a retriever screw driver which may be adapted to hold different size screws by interchanging but a small part of the screw driver.

Still a further object of this invention is to provide a retriever screw driver which may hold not only the screw but a washer simultaneously therewith.

With the foregoing and other objects in view, the invention consists in the construction, combination and arrangement of parts hereinafter described and illustrated `in the drawing, in

which: A

Fig. 1 is anelvfatonal 'w of the screw driver of this invention about ick upthe screw, partly in section;

Fig. 2 is a similar eleva ofal view in the position of discharging the screw;

I Fig. 3 is an enlarged detail sectional view with thebit in position on a screw;

Fig. 4 is a longitudinal sectional view showing a larger screw holding sleeve for operation with a larger screw; and

Fig. 5 is a bottom end view of the complete screw driver.

There is shown at III the screw driver of this invention, comprising a cylindrical shank II having a screw-engaging bit I2 formed at one end thereof, while its other end I3 is firmly embedded in a molded or insulating handle I4, being anchored thereto by means of a pin I5 extending therethrough.

Slidably mounted on the cylindrical shank II is a shiftsleeve I6 extending into a counterbore I1 within the handle I4, a coil spring Il being' located between the end of the shift sleeve Il and the counterbore shoulder 2l within the handle I4, this coil spring I8 normally tending to hold the shift sleeve I6 in the extended position shown in Fig. 1.l A collar 22 molded aboutthe shift sleeve It serves as a handle means for IT while the yieldable coil spring. Il tends to return it to the position shown in Fig. l.

Concentrically mounted on the lower end of the shift sleeve Il adjacent the bit head 23, on which s the bit I2 is formed, is a driver sleeve 24. Fixed yto this driver sleeve 24 by ascrew 25 is a leaf spring 2l having one end bent at right angles as at 21 to extend. into a circumferential depression 2l in the shift sleeve I6. The other end of this leaf spring 2l is formed with a reverse hook 32 shaped as shown, and extending through a slot 3l formed in the driver sleeve 24 between the lower end of the shift sleeve I8 and the shoulder 32 at the back of the bit head 22.

This shoulder 32 limits the outward movement oftheshiftsleeve Itontheshank II.

In operation, the internal diameter of the driver sleeve 24 is approximately equal to or very slightly greater than the external diameter of the screw head 2l of the screw 23 which is being used. To remove the screw 33 from any location, as from a -piece of machinery 34, the screw driver is handled as in Fig. 2, with the lingers drawing the collar 22 of shift sleeve I6 upwardly, so that the driver bit I2 may be inserted into the screw kerf as shown in Fig. 3. The screw driver is then rotated to withdraw the screw, the handle means 22 having meantime` been released so as to cause the shift sleeve I6 under action of the spring I l to move the driver sleeve 24 down over the head 29 of the screw 33. Continuous rotation of the screw driver in the proper direction will cause the screw 23 to move upwardlywhilethe spring Il causes the 35 shift sleeve II to maintain the driver sleeve 24 in contact with the machinery Portion 34 about the screw head 2l. The screw head 29 will then move upwardly into the driver sleeve 24 until Y the reverse hook 30 of leaf spring 26 is against the side of or below the shoulder of the screw head 29 when the screw 32 is completely moved, thereby causing the screw driver to retrieve the screw and hold it in the position shown in Fig. 1, ready for easy removal therefrom with ones lingers.

To insert the screw the reverse procedure is followed, that is, the screw 32 is inserted in the end of the driver sleeve 24 as shown in Fig. 1, until the reverse hook 20 of leaf spring 26 holds it in such position. The screw driver is thenmanipulated to insert the end of the screw I3 into its threaded hole and upon rotation of the screw driver the spring 2i will'gradually be withdrawn from the head 2l of the screw l2. Y

drawing the shift sleeve IB into the counterbore 55 When a screw 26 of different size is to be used,

e sleeve il hsvins e. counterbore it oi s diemeter suhstsntially equal to the heed is is substituted for the driver sleeve 2Q by merely raising the end 2l out of its depression 22%, permitting the sleeve 2e to be removed and permitting the driver sleeve 3l of larger size to be substituted therefor with its identical leaf spring operating in the identical manner.

As shown, e washer di may be placed about the screw 3@ and likewise be held in position about the reverse hook 3G of leef spring 26.

Other modicetions and changes in the proportions d srrengement of the parts may 'be made by those skilled in the srt without depert= ing from the neture of the invention, within the scope of what is hereinafter claimed.

The invention described herein may be manufractured end/or used by or for the Government of the United States of America for governmentsl purposes without the payment of any royalties thereon or therefor Having thus set forth end disclosed the ne ture of this invention, what is claimed is:

il. screw holder end retriever for use with e screw driver hevine s driver shenlr, e, driver head. end driver bit formed et one end thereof, s handle anchored to the other end of seid driver shank, said handle being counterhored about said shank; said screw holder and retriever comprising e shift sleeve concentricellir mounted on said shank heving one end extendable into the connterbore of seid handle, e, coil spring within seid counterhore between the counterhore shoulder end said shift sleeve, s handle ineens formed on seid shift sleeve adjacent seid shenlr handle. the other end ofseid shift sleeve stopping short of said driver heed, s driver sleeve concentricelly mounted en the driver end or seid shift sleeve, yieldeble ineens for removably securing seid driver sleeve to seid shift sleeve, e. slot extending through seid driver sleeve between seid shift sleeve end and seid driver heefti seid yieldeble ineens also extending through seid slot to yield ably hold e. screw inserted therein Awhen seid driver sleeve is extended bevond seid driver heed.

AR B. GREEN. 

